Re: [ANN] Topics for a media summit in Lyon in October

[Hans Verkuil <hverkuil@xs4all.nl>]

On 9/3/19 9:21 AM, Hans Verkuil wrote:
> Hi all,
> 
> I've decided to hold the meeting during the ELCE and not on Thursday.
> Two key people can't be there on Thursday and some travel back Thursday
> evening and so would have to leave early.
> 
> Looking at the schedule I propose instead to have one meeting on
> Tuesday morning concentrating on finalizing the codec support.
> 
> On Wednesday we have a second meeting for libcamera (morning) and looking
> at future V4L2 developments such as v4l2_ext_buffer/format, Request API and
> complex camera pipelines (afternoon).
> 
> Laurent, it would make sense if you or one of the other libcamera devs is
> 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an
> agenda for that meeting?
> 
> I plan on leaving Thursday afternoon, so we have the option to continue the
> talks around that last topic on Thursday morning.
> 
> I have no idea where we will hold these meetings since I've no idea
> what the conference center looks like and if they have suitable places
> for doing something like this. So I'll look around on the Monday and
> mail the details of where to meet then.

Good news: the Linux Foundation found a room for us, for both the Tuesday
morning (8-12AM) and the whole of Wednesday (8AM-6PM).

The room is: Terreaux VIP Lounge - Level 0
It's boardroom seating for 15, screen & Projector, 3 power strips on the tables.

Many thanks to the LF for hosting this for us!

Regards,

	Hans

> 
> Confirmed attendees:
> 
> Boris Brezillon <boris.brezillon@collabora.com>
> Alexandre Courbot <acourbot@chromium.org>
> Nicolas Dufresne <nicolas@ndufresne.ca>
> Tomasz Figa <tfiga@chromium.org>
> Ezequiel Garcia <ezequiel@collabora.com>
> Eugen Hristev <Eugen.Hristev@microchip.com>
> Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> Helen Koike <helen.koike@collabora.com>
> Jacopo Mondi <jacopo@jmondi.org>
> Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Hans Verkuil <hverkuil@xs4all.nl>
> 
> If you are not on this list, but want to join, please let me know.
> 
> Since this is really three half-day meetings, each with a different
> topic, please let me know which of those half-day meetings you want
> to attend.
> 
> Regards,
> 
> 	Hans
> 
> On 8/28/19 12:55 PM, Hans Verkuil wrote:
>> On 8/16/19 10:06 AM, Hans Verkuil wrote:
>>> Rather then discussing topics for a meeting under the subject 'Lisbon'
>>> let's start a new thread referring to the right place :-)
>>>
>>> I will try to organize a room, either during the ELCE or (if that doesn't
>>> work) perhaps on the Thursday afterwards. If that's going to be a problem
>>> for someone, please let me know.
>>
>> I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take
>> that room, but if a lot of people who want to come, will already have left
>> on the Thursday, then there is no point in me reserving this room.
>>
>> So if you are unable to attend on Thursday, then please let me know asap!
>>
>> If Thursday is no problem, then I wanted to have more informal meetings
>> somewhere in the conference center during the morning, and after lunch
>> use the room.
>>
>> If Thursday is a no-go, then we will just have to find a place inside
>> the conference center during the ELCE.
>>
>> Regards,
>>
>> 	Hans
>>
>>>
>>> I do need to know how many people I can expect. I have the following
>>> confirmed attendees (and please reply if you are not listed!):
>>>
>>> Alexandre Courbot <acourbot@chromium.org>
>>> Tomasz Figa <tfiga@chromium.org>
>>> Jacopo Mondi <jacopo@jmondi.org>
>>> Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>>> Hans Verkuil <hverkuil@xs4all.nl>
>>>
>>> I know there were more who mentioned on irc that they would attend,
>>> but it is easier to keep track if I have it in an email.
>>>
>>> Topics posted under the previous thread:
>>>
>>> Tomasz:
>>>
>>> I would want to discuss various v4l2_buffer improvements, e.g.
>>> - DMA-buf import with plane offsets,
>>> - unifying the buffer structs for M and non-M formats,
>>> - ability to import different FDs with offsets for non-M formats if the
>>> layout matches driver expectations, etc.
>>>
>>> Besides that, I would be interested in the general idea on handling
>>> complex cameras in the Linux kernel in spite of the remaining V4L2
>>> limitations, e.g.
>>> - combinatorial explosion of /dev/video nodes,
>>> - significant ioctl overhead,
>>> - huge amount of historical legacy making the driver and userspace
>>> implementations overly difficult and prone to repetitive mistakes,
>>> - the above also limiting the flexibility of the API - formats, frame
>>> rates, etc. set using distinct APIs, not covered by Request API, with
>>> non-failure "negotiation hell", etc.
>>> - lack of fences, etc.
>>>
>>> Jacopo:
>>>
>>> Apart from discussing libcamera and hope we could kickstart a review of
>>> its API, I would like to re-start discussing multiplexed stream support,
>>> but that would require Sakari to be there, something I'm not certain
>>> about. Sakari?
>>>
>>> Alexandre:
>>>
>>> If Collabora/Bootlin is there, I'd certainly want to discuss stateless
>>> codecs, in particular m2m codec helpers and finalize the specification
>>> in general.
>>>
>>> Regards,
>>>
>>> 	Hans
>>>
>>
>